Recent research from the University of Twente has unveiled critical insights into the failure mechanisms of curved woven composites, specifically Glass/Polyphenylene sulfide (G/PPS) materials. This study, led by R.D.R. Sitohang, investigates how variations in thickness and layup configurations affect the structural integrity of these composites during unfolding. The findings could have significant implications for the construction sector, where composite materials are increasingly used for their strength-to-weight ratio and design flexibility.
The research employed tensile-bending tests to observe damage development, utilizing advanced techniques such as acoustic emission sensors and scanning electron microscopy. The results revealed a notable transition in failure mechanisms as laminate thickness increased. “We found that the failure mode shifts from being intraply-dominated to interply-dominated with greater thickness,” Sitohang explained. This shift is crucial for engineers and designers who rely on these materials for structural applications, as it informs how they can predict and mitigate potential failures in real-world conditions.
Moreover, the study highlighted how different layup configurations, particularly in thinner samples, influenced the initiation of damage. All configurations, including [(0,90)]2s, [(90,0)]2s, and [(±45)]2s, showed damage starting at the fiber/matrix interfaces, but the specific mode of initiation varied. This nuanced understanding of damage patterns is vital for optimizing composite designs in construction, where performance under stress is paramount.
The research also noted the presence of intra-yarn cracks at the compression side of 4-ply samples, which led to surface yarn buckling in specific configurations. Sitohang pointed out, “These intra-yarn cracks can significantly impact the durability and longevity of composite structures, making it essential for designers to consider these factors during the planning stages.”
As the construction industry continues to embrace advanced materials for innovative designs and sustainability, findings like these are invaluable. They not only enhance the understanding of material behavior but also guide the development of more resilient structures. This research, published in ‘Composites Part C: Open Access’ (translated as ‘Composites Part C: Open Access’), serves as a pivotal resource for professionals aiming to leverage composite materials in their projects.
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